Chemical Engineering Basics 1000+ MCQ with answer for LSAT

1. The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their
A. Equivalent weight
B. (Equivalent weight)²
C. Molecular weight
D. (Molecular weight)²
Answer : A

2. Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
A. Film
B. Nucleate
C. Transition
D. All modes of
Answer : A

3. Liquor poisoning generally occurs due to the presence of __________ in it.
A. Ethyl alcohol
B. Impurities
C. Methyl alcohol
D. Carbonic acid
Answer : C

4. The value of for air & most common gases can be safely assumed to be
A. 0.8
B. 1
C. 1.4
D. 1.8
Answer : C

5. Identify the correct statement with reference to the extractive metallurgy of aluminium.
A. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3
B. Approximately 80% of the aluminium deposited on the cathode comes from cryolite
C. Sodium is deposited along with aluminium, but is immediately vaporised
D. Anode effect sets in when the cryolite concentration goes below 40%.
Answer : A

6. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is
A. More
B. Less
C. Equal
D. Much more
Answer : C

7. In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be
A. Higher, as it gives higher wavelength
B. Lower, as it gives higher wavelength
C. Higher, as it gives shorter wavelength
D. Lower, as it gives shorter wavelength
Answer : C

8. Working of linear variable differential transducer (LVDT) is based on the principle of variable
A. Capacitance
B. Resistance
C. Mutual inductance
D. None of these
Answer : C

9. The property of material, by which a given amount of energy is absorbed by it, without plastic deformation, is called
A. Resilience
B. Toughness
C. Ductility
D. Impact strength
Answer : A

10. Machinability of hard alloys and tool steels is improved by
A. Spheroidising
B. Annealing
C. Tempering
D. Normalising
Answer : B

11. Sub zero treatment of steel is done to
A. Suppress martensite transformation
B. Enhance its working performance in sub zero atmosphere
C. Reduce the retained austenite in hardened steel
D. Induce temper brittleness after its hardening
Answer : C

12. The phenomenon occurring during explosion of a hydrogen bomb is
A. Nuclear fission
B. Nuclear fusion
C. A combination of both nuclear fission & fusion
D. None of these
Answer : C

13. Which of the following is not a dielectric material?
A. Cotton, silk and paper
B. Asbestos, glass, porcelain and mica
C. Rubber and polymeric resins
D. All refractory materials
Answer : C

14. In the blast furnace, incorporation of water vapour in the blast gives the following effect.
A. Increases the reducing potential of the gas
B. Increases the flame temperature
C. No significant change occurs
D. Increases the hydrogen content in the metal
Answer : A

15. Cold chisels hammers are made of
A. High speed steel
B. High carbon steel
C. Forged steel
D. Mild steel
Answer : B

16. Internal energy of a gas obeying Van-Der- Waals equation of state, [p + (a/v²)] (V - b) = RT, depends upon its
A. Pressure & temperature
B. Pressure & specific volume
C. Temperature & specific volume
D. Temperature only
Answer : A

17. For an ideal gas, C_p - C_v is
A. R
B. -R
C. 0
D. (3/2) R
Answer : A

18. Hydrogen in liquid steels is dissolved
A. As tiny gas bubbles
B. In the atomic form
C. In the ionic form
D. In the molecular form
Answer : A

19. Increase in the entropy of a system represents the
A. Degradation of energy
B. Decrease in system pressure
C. Increase in the availability of energy
D. Increase in the temperature
Answer : A

20. Oxyacetylene reducing flame is used while carrying out welding on
A. Alloy steel
B. Grey cast iron
C. Mild steel
D. High carbon steel
Answer : C

21. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the
A. Rangeis 15°F
B. Approach is 10°F
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

22. What is the value of included angle of a triangular notch for maximum discharge?
A. 30°
B. 60°
C. 90°
D. 120°
Answer : C

23. Pick out the wrong statement.
A. Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in the necked region
B. Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation
C. Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections
D. Brittle materials are generally tested in tension
Answer : B

24. In the Bayer's process, bauxite is digested under pressure using
A. H₂SO₄
B. NaOH
C. NH₃
D. HCl
Answer : B

25. Function of fusible plug in a boiler is to
A. Drain out water and sludge from the boiler during repair
B. Put off fire in the furnace when water level in the boiler falls to unsafe limit
C. Guard the boiler in case of abnormal rise in steam pressure
D. All (A), (B) & (C)
Answer : B

26. Heat release during phase change is observed in case of a/an
A. Boiler
B. Condenser
C. Evaporator
D. All (A), (B) & (C)
Answer : B

27. The pressure outside a bubble/droplet of liquid is __________ the internal pressure.
A. Greater than
B. Less than
C. Equal to
D. Unpredictable; depends on the bubble size
Answer : B

28. Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.
A. 2
B. 3
C. 0.8
D. 6
Answer : B

29. The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
A. Is as light as possible
B. Has very high C.O.P.
C. Employs minimum quantity of refrigerant
D. Consumer minimum horse power
Answer : A

30. At 100% relative humidity, the dew point temperature of moist air is
A. Less than the wet bulb temperature
B. More than the wet bulb temperature
C. Equal to the wet bulb temperature
D. Equal to the ambient temperature
Answer : B

31. The unit of gc is
A. lb_m/lb_f. ft/sec²
B. lb_f/lb_m. ft/sec²
C. ft/sec²
D. lb_m/lb_f. sec²/ft
Answer : A

32. L.D. (Linz-Donawitz) converter is used in the production of
A. Copper
B. Steel
C. Zinc
D. Aluminium
Answer : B

33. All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.
A. Deuterium
B. Hydrogen
C. Neon
D. Helium
Answer : B

34. Starting friction is low in case of the __________ lubrication.
A. Boundary
B. Hydrodynamic
C. Hydrostatic
D. Mixed/semi-fluid
Answer : C

35. At absolute zero temperature, for any reaction involving condensed phases
A. ? G° = 0 , ? H° = 0
B. ? H° = 0 , ? S° = 0
C. ? S° = 0 , ? E° = 0
D. ? S° = 0 , ? Cp° = 0
Answer : C

36. Water flow in the river during flood can be categorised as the __________ flow.
A. Unsteady uniform
B. Unsteady non-uniform
C. Steady uniform
D. Steady non-uniform
Answer : B

37. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
A. Grey
B. Black
C. Opaque
D. White
Answer : A

38. A fluid is termed as the Newtonian fluid, when the shear stress is __________ the velocity gradient.
A. Independent of
B. Inversely proportional to
C. Directly proportional to
D. None of these
Answer : C

39. Faraday's law of electrolysis is related to the
A. Cation speed
B. Atomic number of the cation
C. Equivalent mass of the electrolyte
D. None of these
Answer : C

40. Laser welding is widely employed in the __________ industries.
A. Electronic
B. Structural
C. Process
D. Heavy
Answer : A

41. The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
A. 0.5
B. 3
C. 10
D. 25
Answer : B

42. __________ property of a material is determined by the Herbert Pendulum device.
A. Hardness
B. Tensile
C. Toughness
D. Compressive
Answer : A

43. Spark plug is provided in a/an
A. Engine having carburettor
B. Diesel engine
C. Compression ignition engine
D. Both (B) & (C)
Answer : A

44. Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as
A. Re^0.5, Re^0.8
B. Re^0.8, Re^-0.5
C. Re^0.8, Re^0.5
D. Re^-0.8, Re^0.5
Answer : C

45. __________ is the most important element, which controls the physical properties of steel.
A. Manganese
B. Silicon
C. Carbon
D. Vanadium
Answer : C

46. The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
A. 0
B. 100
C. 50
D. None of these
Answer : B

47. For efficient performance of a blast furnace, the extent of reduction of Wustite (F_eO) should be
A. 100% indirect reduction
B. 100% direct reduction
C. 50-60% indirect reduction
D. 30-40% indirect reduction
Answer : C

48. Which of the following is not a ferromagnetic material?
A. Nickel
B. Cobalt
C. Aluminium
D. Iron
Answer : C

49. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.
A. 250
B. 500
C. 1000
D. 3000
Answer : B

50. Which of the following is an acidic constituent of B.F. slag?
A.
B. FeO
C. MgO
D. CaO
Answer : A